sodininkystė ir daržininkystė 25(4)

Correlation coefficient (r) between total chlorophyll content in bean leaves and ETR
was about 0.6. The content of chlorophyll was not markedly increased by examined
growth regulators
Conclusions. Experimental growth regulators, Carboxylic acid hydrazid derivatives
(CAHD) – st-120 and st-119, applied on bean hypocotyl cuttings had
the auxin like effect. The CAHD st-120 at 0.05 mg·l -1 and 0.075 mg·l -1 as well as
st-119 at 0.1 mg·l -1 and 0.25 mg·l -1 concentrations significantly induced been
adventitious root initiation. Abovementioned experimental growth regulators also
positively affected bean photosynthetic performance by increasing ETR, which
represents photosynthetic energy conversion and can be correlated with quantum
yield of CO 2
assimilation. Photochemical quenching of chlorophyll fluorescence
(qP) was also increased in beans, treated with physiologically effective
CAHD concentrations. Raised value of qP was associated with higher proportion
of oxidized Q A
(fraction of open PS II reaction centers) and improved activity
of Calvin cycle.
Gauta 2006-11-06
Parengta spausdinti 2006-12-11
References
1. Ahmad A., Hayat S., Fariduddin Q., Ahmad I. Photosynthetic efficiency of plants
of Brassica juncea, treated with chlorosubstituted auxins // Photosynthetica. 2001.
Vol. 39(4). P. 565–568.
2. Baker N. R., Rosenqvist E. Applications of chlorophyll fluorescence can improve
crop production strategies: an examination of future possibilities // J Exp Bot. 2004.
Vol. 55(44). P. 1607–1621.
3. Chen J., Witham F. H., Heuser C. W. Inhibition of NAA - induced adventitious
roots in mung bean cuttings by kinetin, zeatin, ethidium bromide and other DNA intercalators
// The World Wide Web Journal of Biology. 1995. Vol. 1.
4. Chory J., Reinecke D., Sim S., Washbum T., Brenner M. A role for cytokinins in deetiolation
in Arabidopsis det mutants have an altered response to cytokinins // Plant
Physiol. 1994. Vol. 104. P. 339–347.
5. Fang B., Junjiang S., Shari R. B., Gloria K. M., Tadao A., Zhenbiao Y. Brassinosteroids
interact with auxin to promote lateral root development in Arabidopsis // Plant
Physiology. 2004. Vol. 134. P. 1624–1631.
6. Genty B., Briantais J. M., Baker N. R. The relationship between the quantum yield
of photosynthetic electron transport and quenching of chlorophyll fluorescence // Biochim
Biophys Acta. 1989. Vol. 990. P. 87–92.
7. Govindjee. Sixty-three years since Kautsky: chlorophyll a fluorescence // Aust J
Plant Physiol. 1995. Vol. 22. P. 20–90.
8. Hausman J. F. Changes in peroxidase activity, auxin level and ethylene production
during root formation by poplar shoots raised in vitro // Plant Growth Regul. 1993. Vol. 13.
P. 263–268.
9. Husen J. I. A., Dequan L. I. Relationship between photosystem II electron transport
and photosynthetic CO 2
assimilation responses to irradiance in young apple tree
leaves // Photosynthetica. 2002. Vol. 40(1). P. 139–144.
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